13-2

Edit 0 32 …
Balancing Equations Worksheet<---Previous Assignment - Next Assignment--->

Time Length
  • 5 Days
Instructions

Complete the "worksheet" below. Read all directions carefully.

Worksheet
  1. Create a new page titled 13-2 Balancing Equations
  2. go to http://education.jlab.org/elementbalancing/index.html
  3. do 5 advanced problems at a time. (Minimum of 50 correct answers for full credit.)
  4. Copy the final results by highlighting from the top left of the first equation, dragging your mouse to the bottom right of the last tries needed number to your page then identify the type of reaction in the middle empty box before you do any more.
    1. If you are running out of time, click check my answer till it lets you skip to the end, then copy your results.
    2. Only the ones you get right count.

Balanced Equation
 type of Reaction
 Tries Needed
C10H8 + 12 O2→ 10 CO2 + 4 H2O
 Combustion (because it has oxygen on the left, CO2, and H2O on the right
 1
8 Fe + S8 → 8 FeS
 Synthesis (because it puts many things into one)
 1
2 H2O → 2 H2 + O2
 Decomposition (because it is one thing breaking down into many)
 1
Mg + 2 H2O → Mg(OH)2 + H2
 Single Replacement (One of the reactants looses stuff to the other)
 1
Pb(NO3)2 + 2 KI → PbI2 + 2 KNO3
 Double Replacement (both reactants switch stuff with each other)
 1
Review Videos
When you finish with the above and you want extra practice, Do the word problems below
  • This video will show you how

Important notes:
Hydrogen gas = H2
Nitrogen gas = N2
Oxygen gas = O2
Fluorine gas = F2
Chlorine gas = Cl2
Bromine liquid = Br2
Iodine solid = I2
Unless otherwise stated, water is in liquid form.

For each of the following, write the skeleton equation and then balance the equation. Be sure to use all proper symbols like (s), (l), (g), and (aq). Write your answers on your own paper.

Example:
Hydrogen sulfide gas reacts with oxygen gas to yield sulfur dioxide gas and water.
Skeleton equation: H2S(g) + O2(g) → SO2(g) + H2O(l)
Balanced equation: 2H2S(g) + 3O2(g) → 2SO2(g) + 2H2O(l)
(You need not write the equation twice, just balance the skeleton equation.)


  1. Liquid carbon disulfide reacts with oxygen gas to yield carbon dioxide gas and sulfur dioxide gas.
  2. Methane (CH4) gas reacts with oxygen gas to yield carbon dioxide gas and water.
  3. Solid zinc sulfide reacts with oxygen gas to yield solid zinc oxide and sulfur dioxide gas.
  4. Solid phosphorus (P4) reacts with oxygen gas to yield phosphorus(V) oxide gas.
  5. Solid potassium chlorate decomposes when heated to yield solid potassium chloride and oxygen gas.
  6. Solid sodium nitrate decomposes when heated to yield solid sodium nitrite and oxygen gas.
  7. Solid copper(II) nitrate decomposes when heated to yield solid copper(II) oxide, nitrogen dioxide, and oxygen gas.
  8. Solid phosphorus(III) oxide reacts with oxygen to yield phosphorus(V) oxide.
  9. Ozone (O3) gas decomposes to yield oxygen gas.
  10. Solid iron reacts with water to yield solid iron(III) oxide and hydrogen gas.